How do you know who gets the tip? Panera used to refuse tips. Now I go in and I'm presented with tip amounts at the point of sale. Who get's that tip? The cashi

How do you know who gets the tip? Panera used to refuse tips. Now I go in and I'm presented with tip amounts at the point of sale. Who get's that tip? The cashier? The person in back making my food? The person who comes by and busses my table? Or none of the above? Is Panera just pocketing what I'm willing to throw in extra? Maybe it is market research, they figure if I'm willing to tip 20% instead of 15%, then the should charge more for the sandwich?